Datasheet

LT1366/LT1367
LT1368/LT1369
11
1366fb
Typical perForMance characTerisTics
(The data presented here applies to the LT1366/LT1367/LT1368/LT1369 unless otherwise noted.)
THD + Noise vs Frequency
Large-Signal Response
(LT1366/LT1367)
Small-Signal Response
(LT1366/LT1367)
FREQUENCY (kHz)
0.01
0.001
THD + NOISE (%)
0.01
0.1
1
0.1 1 10
LT1366 TPC28
V
S
= ±1.5V
V
IN
= 2V
P-P
R
L
= 10k
A
V
= 1
A
V
= –1
0V
100µs/DIV
LT1366 TPC29
V
S
= ±15V
UNITY GAIN
5V/DIV
2µs/DIV
LT1366 TPC30
V
S
= ±15V
UNITY GAIN
5mV/DIV
applicaTions inForMaTion
Rail-to-Rail Operation
The LT1366 family differs from conventional op amps in the
design of both the input and output stages. Figure 1 shows
a simplified schematic of the amplifier. The input stage
consists of two differential amplifiers, a PNP stage Q1/Q2
and an NPN stage Q3/Q4, which are active over different
portions of the input common mode range. Lateral devices
are used in both input stages, eliminating the need for
clamps across the input pins. Each input stage is trimmed
for offset voltage. A complementary output configuration
(Q23 through Q26) is employed to create an output stage
with rail-to-rail swing. The amplifier is fabricated on Linear
Q24
D7
Q23
Q25
V
–
V
–
V
–
V
+
V
+
V
+
V
+
V
–
C1
C2
Q26
D8
Q22
Q21
D6
Q17
Q16
Q18
Q15
Q19
Q20
D5D4
D7
Q11
I
1
Q10
Q14
C
C
Q13
Q9
Q8
Q7
D2
Q1 Q2
Q5
D1
Q3 Q4
Q6
D3
Q12
OUT
V
+
– 300mV
V
+
V
–
IN
+
IN
–
LT1366 FO1
Figure 1. LT1366 Simplified Schematic Diagram